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Flow measuring device

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yorkie_chris:
I'm wanting to make a fuel flow monitoring device, the only workable idea I have so far is for something resembling a hydraulic motor. A vaned rotor in a close-fitting housing with an inlet and output port within a tangent to the outer diameter.

The shaft would have a toothed/slotted disc on it for an opto-encoder to pick up.
The sort of flow rate we're looking at is between 30-400ml/min approximately.

All the things I can find meant for the job seem expensive or massive, and as it's for a bike there isn't that much room, and I'm poor.

Has anyone built one? Does anyone know if the bare flowmeter modules are available cheaply? Any ideas of parts that could be scavenged from elsewhere?

jim:
is this for a gravity fed system?

Noitoen:
You could build a small gear pump style flow meter but with the body made of acrylic plastic and no output shaft. Mount the optical sensor to count one of the gear's teeth. If the engine has fuel injection, you can build a sensor to "add" the injector activation period which is proportional to the fuel injected.

BillTodd:
With a little effort, you might be able to use one of these thermal flow sensors (~£25):

http://uk.farnell.com/ist/fs1l-0-1l-195/flow-sensor-fluids/dp/1266954

yorkie_chris:
Unfortunately it's for carb bike, so no chance of getting fuel flow rate by adding up injector durations or anything.


--- Quote from: jim on July 13, 2011, 01:51:48 PM ---is this for a gravity fed system?


--- End quote ---

Yes

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